AlCl<sub>3</sub>∙6H<sub>2</sub>O中Mg杂质的去除工艺

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Abstract AlCl₃·6H₂O (ACH) is an important intermediate product in the process of extracting Al₂O₃ from fly ash by hydrochloric acid. The purity of ACH directly determines the purity of the product Al₂O₃. Among them, it is an important way to improve the purity of ACH by washing. In this paper, the washing process parameters of ACH were studied from many aspects. It was found that the washing effect of spray washing is slightly better than that of stirring washing when saturated AlCl₃ solution was used as the washing solution, and the washing efficiency of thre-times washing is similar to that of four-times washing. The higher the content of impurity MgO in the raw material, the higher the impurity MgO content in the product after washing. Stimultaneously, the corresponding washing efficiency is also increased. The washing effect of the ratio of 1:1.5 (mass of ACH/ mass of washing solution)is better than that of 1:1. After three times washing, the crystal loss rate is 19.2% and 16.7%, respectively. The loss rate of crystal can be greatly reduced when the washing solution is reused. The washing effect of HCl solution with mass fraction of 29% is slightly lower than that of saturated AlCl₃ solution. After three times washing, the crystal loss rate is more than 50%, and it can be reduced after the washing solution is reused.

Key words： fly ash Al₂O₃ AlCl₃·6H₂O(ACH) washing MgO

Received: 07 May 2020 Published: 18 January 2021

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	Articles by authors
	CHAO Xiaoguang
	GAO Guimei
	WANG Hongbin
	CAO Kun
	DAI Yin
	SONG Litao
	ZOU Ping
	WANG Yongwang

Cite this article:

CHAO Xiaoguang,GAO Guimei,WANG Hongbin, et al. Removal process of Mg impurity in AlCl₃∙6H₂O[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(5): 433-439.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I5/433

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